Electric plug



July 11, 1933. E ,LQOSU 1,917,803

ELECTRIC PLUG Filed March 2, 1932 f1 Homey Patented July 11, 1933 PATENT OFFICE EUGENE LOOSLI, OF IJION, NEW YORK ELEGTBAIC PLUG Application llled Iarch 2, 1982. Serial No. 598,367.

This invention relates to an electric plug or connection, the general object of the invention being to provide means whereby one part of the'connection can have rotary movement in relation to the other part so that the conductors will not be twisted when they are given a rotary movement.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts to be hereinafter fully described, illustrated in the accompanyin drawing and specifically pointed out in 51e claims appended.

In describing the invention in detail reference will be had to the accompanying rawing wherein like characters denote like or corresponding parts throughout the several views, and in which Figure 1 is a sectional vention.

Fig. 2 is a sectional view through the shell before being bent and before receiving the insulated covering.

Fig. 3 is a section on line 3--3 of 1.

Fig. 4 is a similar view but showing a modification.

In the drawin view thru the inthe letter A indicates the stationary part o the device which is formed 3 of a metal shell 1 having its bottom formed with a tubular part2 exteriorly threaded to t in a threaded socket and this tubular part contains a block 3 of non-conducting material through the center of which passes a metal tube 4, the upper end of which is slightly contracted to form a seat for a ball 5 whic is normally held upon the seat by the spring 6 in the tube, and the spring is held in place by a screw 7 screwed into the lower end of the tube. The upper part of the shell l is bent inwardly to form a flange which acts to hold a raceway 8 in the shell, the major part of the shell being covered by insulating material 9. A number of balls 10 are carried by an annular spacer member or ball cage 11, these balls partly fitting in the groove of the raceway 8 and these balls also lit in an exterior groove formed in a central tubular part 12, the outer end of which iiares outwardly as shown in Fig. 1. This tubular nected.

part is internally threaded to receive the usual plug 13 and the flaring part of the tubular member 12 is covered with insulating material as shown at 14.

Thus it will be seen that the plug 13 can screwed into the member l2 and that said member 12 is rotatably supported in the member A through means of the balls 10 so that the plug 13 and the part 12 rotate in the member A thereby preventing twisting the wires or conductors connecting the plug 13 when the same are turned or rotated in any manner, which rotar movement to the parts will not interrupt the flow of current, it of course ter contact of the plug 13 enga es the ball 5 as shown in Fig. l, while the p ug is electrically connected to the part 2 through the member 12, balls 10, the raceway 8, and the shell 1, to which the tubular part 2 is con- When the device is to be used as a signaldevice, or instrument, where it is desired to alternately make and break the circuit during the rotation of the member connected. with the plug 13, strips 15 of non-conductin material can be embedded in the raceway 8 so that the balls 10 will contact these strips during the rotation o f the arts 12 and when this occurs, the current is as the balls pass off the stri s onto the metal of the parts or raceway 8 the circuit will be made again and thus the circuit will be alternately opened and closed.

It is thought from the foregoin description that the advantages land nove features of the invention will be readily apparent.

It is to be understood that chan es may be made in the construction and in t e combeing understood that the cen- 5 roken but as soon bination and arrangement of theseveral parts 9 provided that such changes fall within the sccpe of the appended claims.

aving thus ascribed my invention, what I claim as new 1s:-

1. A device of the class described comprising a stationary part having a raceway therein, a tubular part connected with the firstmentioned part and electrically connected with the raceway, a block of non-conducting material placed in the tubular part and containing a contact, a plug receiving member rotatably arranged in the first part, balls placed between the raceway and the plug receiving member, a plug in said member and removably arranged therein and having its center contact engaging the first-mentioned contact, and spaced strips of insulating material forming portions of the raceway for interrupting the circuit when the balls engage the same.

2. A device of the class described comprising a metal shell having a reduced tubular portion extending from its bottom for fitting in a socket, a member of non-conducting material located in said tubular portion, a Contact carried by said member, a raceway in the shell, the upper edge of the shell being t ireaded in said member an having its center contact engaging the first-mentioned Contact; said plug carrying member having its upper end flaring outwardly to provide a finger engaging part and a cover of non-conducting material for said part. l

In testimony whereof I affix my signature.

` EUGENE LOOSLI.

ius 

